1
|
Seibertz F, Voigt N. High-throughput methods for cardiac cellular electrophysiology studies: the road to personalized medicine. Am J Physiol Heart Circ Physiol 2024; 326:H938-H949. [PMID: 38276947 DOI: 10.1152/ajpheart.00599.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 01/22/2024] [Accepted: 01/22/2024] [Indexed: 01/27/2024]
Abstract
Personalized medicine refers to the tailored application of medical treatment at an individual level, considering the specific genotype or phenotype of each patient for targeted therapy. In the context of cardiovascular diseases, implementing personalized medicine is challenging due to the high costs involved and the slow pace of identifying the pathogenicity of genetic variants, deciphering molecular mechanisms of disease, and testing treatment approaches. Scalable cellular models such as human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) serve as useful in vitro tools that reflect individual patient genetics and retain clinical phenotypes. High-throughput functional assessment of these constructs is necessary to rapidly assess cardiac pathogenicity and test new therapeutics if personalized medicine is to become a reality. High-throughput photometry recordings of single cells coupled with potentiometric probes offer cost-effective alternatives to traditional patch-clamp assessments of cardiomyocyte action potential characteristics. Importantly, automated patch-clamp (APC) is rapidly emerging in the pharmaceutical industry and academia as a powerful method to assess individual membrane-bound ionic currents and ion channel biophysics over multiple cells in parallel. Now amenable to primary cell and hiPSC-CM measurement, APC represents an exciting leap forward in the characterization of a multitude of molecular mechanisms that underlie clinical cardiac phenotypes. This review provides a summary of state-of-the-art high-throughput electrophysiological techniques to assess cardiac electrophysiology and an overview of recent works that successfully integrate these methods into basic science research that could potentially facilitate future implementation of personalized medicine at a clinical level.
Collapse
Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells," Georg-August University Göttingen, Göttingen, Germany
- Nanion Technologies, GmbH, Munich, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells," Georg-August University Göttingen, Göttingen, Germany
| |
Collapse
|
2
|
Paasche A, Wiedmann F, Kraft M, Seibertz F, Herlt V, Blochberger PL, Jávorszky N, Beck M, Weirauch L, Seeger T, Blank A, Haefeli WE, Arif R, Meyer AL, Warnecke G, Karck M, Voigt N, Frey N, Schmidt C. Acute antiarrhythmic effects of SGLT2 inhibitors-dapagliflozin lowers the excitability of atrial cardiomyocytes. Basic Res Cardiol 2024; 119:93-112. [PMID: 38170280 PMCID: PMC10837223 DOI: 10.1007/s00395-023-01022-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Revised: 11/08/2023] [Accepted: 11/24/2023] [Indexed: 01/05/2024]
Abstract
In recent years, SGLT2 inhibitors have become an integral part of heart failure therapy, and several mechanisms contributing to cardiorenal protection have been identified. In this study, we place special emphasis on the atria and investigate acute electrophysiological effects of dapagliflozin to assess the antiarrhythmic potential of SGLT2 inhibitors. Direct electrophysiological effects of dapagliflozin were investigated in patch clamp experiments on isolated atrial cardiomyocytes. Acute treatment with elevated-dose dapagliflozin caused a significant reduction of the action potential inducibility, the amplitude and maximum upstroke velocity. The inhibitory effects were reproduced in human induced pluripotent stem cell-derived cardiomyocytes, and were more pronounced in atrial compared to ventricular cells. Hypothesizing that dapagliflozin directly affects the depolarization phase of atrial action potentials, we examined fast inward sodium currents in human atrial cardiomyocytes and found a significant decrease of peak sodium current densities by dapagliflozin, accompanied by a moderate inhibition of the transient outward potassium current. Translating these findings into a porcine large animal model, acute elevated-dose dapagliflozin treatment caused an atrial-dominant reduction of myocardial conduction velocity in vivo. This could be utilized for both, acute cardioversion of paroxysmal atrial fibrillation episodes and rhythm control of persistent atrial fibrillation. In this study, we show that dapagliflozin alters the excitability of atrial cardiomyocytes by direct inhibition of peak sodium currents. In vivo, dapagliflozin exerts antiarrhythmic effects, revealing a potential new additional role of SGLT2 inhibitors in the treatment of atrial arrhythmias.
Collapse
Affiliation(s)
- Amelie Paasche
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Felix Wiedmann
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Manuel Kraft
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research) Partner Site Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Robert Koch Strasse 40, 37075, Göttingen, Germany
| | - Valerie Herlt
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Pablo L Blochberger
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Natasa Jávorszky
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Moritz Beck
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Leo Weirauch
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Timon Seeger
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
| | - Antje Blank
- Department of Clinical Pharmacology and Pharmacoepidemiology, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Walter E Haefeli
- Department of Clinical Pharmacology and Pharmacoepidemiology, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Rawa Arif
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Anna L Meyer
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Gregor Warnecke
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Matthias Karck
- Department of Cardiac Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research) Partner Site Göttingen, Robert Koch Strasse 42a, 37075, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Robert Koch Strasse 40, 37075, Göttingen, Germany
| | - Norbert Frey
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany
| | - Constanze Schmidt
- Department of Cardiology, Medical University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
- DZHK (German Center for Cardiovascular Research), Partner site Heidelberg/Mannheim, University of Heidelberg, Im Neuenheimer Feld 669, 69120, Heidelberg, Germany.
- HCR, Heidelberg Center for Heart Rhythm Disorders, University Hospital Heidelberg, Im Neuenheimer Feld 410, 69120, Heidelberg, Germany.
| |
Collapse
|
3
|
Bloothooft M, Verbruggen B, Seibertz F, van der Heyden MAG, Voigt N, de Boer TP. Recording ten-fold larger I Kr conductances with automated patch clamping using equimolar Cs + solutions. Front Physiol 2024; 15:1298340. [PMID: 38328302 PMCID: PMC10847579 DOI: 10.3389/fphys.2024.1298340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Accepted: 01/09/2024] [Indexed: 02/09/2024] Open
Abstract
Background: The rapid delayed rectifier potassium current (IKr) is important for cardiac repolarization and is most often involved in drug-induced arrhythmias. However, accurately measuring this current can be challenging in human-induced pluripotent stem cell (hiPSC)-derived cardiomyocytes because of its small current density. Interestingly, the ion channel conducting IKr, hERG channel, is not only permeable to K+ ions but also to Cs+ ions when present in equimolar concentrations inside and outside of the cell. Methods: In this study, IhERG was measured from Chinese hamster ovary (CHO)-hERG cells and hiPSC-CM using either Cs+ or K+ as the charge carrier. Equimolar Cs+ has been used in the literature in manual patch-clamp experiments, and here, we apply this approach using automated patch-clamp systems. Four different (pre)clinical drugs were tested to compare their effects on Cs+- and K+-based currents. Results: Using equimolar Cs+ solutions gave rise to approximately ten-fold larger hERG conductances. Comparison of Cs+- and K+-mediated currents upon application of dofetilide, desipramine, moxifloxacin, or LUF7244 revealed many similarities in inhibition or activation properties of the drugs studied. Using equimolar Cs+ solutions gave rise to approximately ten-fold larger hERG conductances. In hiPSC-CM, the Cs+-based conductance is larger compared to the known K+-based conductance, and the Cs+ hERG conductance can be inhibited similarly to the K+-based conductance. Conclusion: Using equimolar Cs+ instead of K+ for IhERG measurements in an automated patch-clamp system gives rise to a new method by which, for example, quick scans can be performed on effects of drugs on hERG currents. This application is specifically relevant when such experiments are performed using cells which express small IKr current densities in combination with small membrane capacitances.
Collapse
Affiliation(s)
- Meye Bloothooft
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
| | - Bente Verbruggen
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
- Nanion Technologies GmbH, Munich, Germany
| | - Marcel A. G. van der Heyden
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
| | - Teun P. de Boer
- Department of Medical Physiology, Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, Netherlands
| |
Collapse
|
4
|
Seibertz F, Rubio T, Springer R, Popp F, Ritter M, Liutkute A, Bartelt L, Stelzer L, Haghighi F, Pietras J, Windel H, Pedrosa NDI, Rapedius M, Doering Y, Solano R, Hindmarsh R, Shi R, Tiburcy M, Bruegmann T, Kutschka I, Streckfuss-Bömeke K, Kensah G, Cyganek L, Zimmermann WH, Voigt N. Atrial fibrillation-associated electrical remodelling in human induced pluripotent stem cell-derived atrial cardiomyocytes: a novel pathway for antiarrhythmic therapy development. Cardiovasc Res 2023; 119:2623-2637. [PMID: 37677054 PMCID: PMC10730244 DOI: 10.1093/cvr/cvad143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 07/18/2023] [Accepted: 08/03/2023] [Indexed: 09/09/2023] Open
Abstract
AIMS Atrial fibrillation (AF) is associated with tachycardia-induced cellular electrophysiology alterations which promote AF chronification and treatment resistance. Development of novel antiarrhythmic therapies is hampered by the absence of scalable experimental human models that reflect AF-associated electrical remodelling. Therefore, we aimed to assess if AF-associated remodelling of cellular electrophysiology can be simulated in human atrial-like cardiomyocytes derived from induced pluripotent stem cells in the presence of retinoic acid (iPSC-aCM), and atrial-engineered human myocardium (aEHM) under short term (24 h) and chronic (7 days) tachypacing (TP). METHODS AND RESULTS First, 24-h electrical pacing at 3 Hz was used to investigate whether AF-associated remodelling in iPSC-aCM and aEHM would ensue. Compared to controls (24 h, 1 Hz pacing) TP-stimulated iPSC-aCM presented classical hallmarks of AF-associated remodelling: (i) decreased L-type Ca2+ current (ICa,L) and (ii) impaired activation of acetylcholine-activated inward-rectifier K+ current (IK,ACh). This resulted in action potential shortening and an absent response to the M-receptor agonist carbachol in both iPSC-aCM and aEHM subjected to TP. Accordingly, mRNA expression of the channel-subunit Kir3.4 was reduced. Selective IK,ACh blockade with tertiapin reduced basal inward-rectifier K+ current only in iPSC-aCM subjected to TP, thereby unmasking an agonist-independent constitutively active IK,ACh. To allow for long-term TP, we developed iPSC-aCM and aEHM expressing the light-gated ion-channel f-Chrimson. The same hallmarks of AF-associated remodelling were observed after optical-TP. In addition, continuous TP (7 days) led to (i) increased amplitude of inward-rectifier K+ current (IK1), (ii) hyperpolarization of the resting membrane potential, (iii) increased action potential-amplitude and upstroke velocity as well as (iv) reversibly impaired contractile function in aEHM. CONCLUSIONS Classical hallmarks of AF-associated remodelling were mimicked through TP of iPSC-aCM and aEHM. The use of the ultrafast f-Chrimson depolarizing ion channel allowed us to model the time-dependence of AF-associated remodelling in vitro for the first time. The observation of electrical remodelling with associated reversible contractile dysfunction offers a novel platform for human-centric discovery of antiarrhythmic therapies.
Collapse
Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
| | - Tony Rubio
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Robin Springer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Fiona Popp
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Melanie Ritter
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Aiste Liutkute
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Lena Bartelt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Lea Stelzer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Fereshteh Haghighi
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Jan Pietras
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Hendrik Windel
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Núria Díaz i Pedrosa
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | | | - Yannic Doering
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Richard Solano
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Robin Hindmarsh
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Germany
| | - Runzhu Shi
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - Malte Tiburcy
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
| | - Tobias Bruegmann
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- Institute for Cardiovascular Physiology, University Medical Center Göttingen, Göttingen, Germany
| | - Ingo Kutschka
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Katrin Streckfuss-Bömeke
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Germany
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
| | - George Kensah
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Department of Cardiothoracic and Vascular Surgery, Georg-August-University Göttingen, Göttingen, Germany
| | - Lukas Cyganek
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Germany
| | - Wolfram H Zimmermann
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), Göttingen, Germany
- Campus-Institute Data Science (CIDAS), University of Göttingen, Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
| |
Collapse
|
5
|
Kyriakopoulou E, Versteeg D, de Ruiter H, Perini I, Seibertz F, Döring Y, Zentilin L, Tsui H, van Kampen SJ, Tiburcy M, Meyer T, Voigt N, Tintelen VJP, Zimmermann WH, Giacca M, van Rooij E. Therapeutic efficacy of AAV-mediated restoration of PKP2 in arrhythmogenic cardiomyopathy. Nat Cardiovasc Res 2023; 2:1262-1276. [PMID: 38665939 PMCID: PMC11041734 DOI: 10.1038/s44161-023-00378-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 10/27/2023] [Indexed: 04/28/2024]
Abstract
Arrhythmogenic cardiomyopathy is a severe cardiac disorder characterized by lethal arrhythmias and sudden cardiac death, with currently no effective treatment. Plakophilin 2 (PKP2) is the most frequently affected gene. Here we show that adeno-associated virus (AAV)-mediated delivery of PKP2 in PKP2c.2013delC/WT induced pluripotent stem cell-derived cardiomyocytes restored not only cardiac PKP2 levels but also the levels of other junctional proteins, found to be decreased in response to the mutation. PKP2 restoration improved sodium conduction, indicating rescue of the arrhythmic substrate in PKP2 mutant induced pluripotent stem cell-derived cardiomyocytes. Additionally, it enhanced contractile function and normalized contraction kinetics in PKP2 mutant engineered human myocardium. Recovery of desmosomal integrity and cardiac function was corroborated in vivo, by treating heterozygous Pkp2c.1755delA knock-in mice. Long-term treatment with AAV9-PKP2 prevented cardiac dysfunction in 12-month-old Pkp2c.1755delA/WT mice, without affecting wild-type mice. These findings encourage clinical exploration of PKP2 gene therapy for patients with PKP2 haploinsufficiency.
Collapse
Affiliation(s)
- Eirini Kyriakopoulou
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Danielle Versteeg
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Hesther de Ruiter
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Ilaria Perini
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- Nanion Technologies GmbH, Munich, Germany
| | - Yannic Döring
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Lorena Zentilin
- International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
| | - Hoyee Tsui
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
| | | | - Malte Tiburcy
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Tim Meyer
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
| | | | - Wolfram H. Zimmermann
- Institute of Pharmacology and Toxicology, University Medical Center Gottingen (UMG), Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), partner site Göttingen, Göttingen, Germany
- Cluster of Excellence ‘Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells’ (MBExC), University of Göttingen, Göttingen, Germany
- German Center for Neurodegenerative Diseases (DZNE), Göttingen, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology (ITMP), Göttingen, Germany
| | - Mauro Giacca
- International Centre for Genetic Engineering and Biotechnology (ICGEB), Trieste, Italy
- British Heart Foundation Centre of Research Excellence, School of Cardiovascular Medicine & Sciences, King’s College London, London, UK
| | - Eva van Rooij
- Hubrecht Institute-KNAW and Utrecht University Medical Center, Utrecht, the Netherlands
- Department of Cardiology, University Medical Center Utrecht, Utrecht, the Netherlands
| |
Collapse
|
6
|
Voigt N, Seibertz F, Fakuade FE. Vicious Twins: RyR2 Dysfunction and Structural Remodeling. Circ Res 2023; 133:193-195. [PMID: 37410856 DOI: 10.1161/circresaha.123.323144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Affiliation(s)
- Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
| | - Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg August University Göttingen, Germany (N.V., F.S., F.E.F.)
- DZHK (German Center for Cardiovascular Research), partner site Göttingen, Germany (N.V., F.S., F.E.F.)
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Germany (N.V., F.S., F.E.F.)
| |
Collapse
|
7
|
Seibertz F, Sutanto H, Dülk R, Pronto JRD, Springer R, Rapedius M, Liutkute A, Ritter M, Jung P, Stelzer L, Hüsgen LM, Klopp M, Rubio T, Fakuade FE, Mason FE, Hartmann N, Pabel S, Streckfuss-Bömeke K, Cyganek L, Sossalla S, Heijman J, Voigt N. Electrophysiological and calcium-handling development during long-term culture of human-induced pluripotent stem cell-derived cardiomyocytes. Basic Res Cardiol 2023; 118:14. [PMID: 37020075 PMCID: PMC10076390 DOI: 10.1007/s00395-022-00973-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 12/13/2022] [Accepted: 12/15/2022] [Indexed: 04/07/2023]
Abstract
Human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) are increasingly used for personalised medicine and preclinical cardiotoxicity testing. Reports on hiPSC-CM commonly describe heterogenous functional readouts and underdeveloped or immature phenotypical properties. Cost-effective, fully defined monolayer culture is approaching mainstream adoption; however, the optimal age at which to utilise hiPSC-CM is unknown. In this study, we identify, track and model the dynamic developmental behaviour of key ionic currents and Ca2+-handling properties in hiPSC-CM over long-term culture (30-80 days). hiPSC-CMs > 50 days post differentiation show significantly larger ICa,L density along with an increased ICa,L-triggered Ca2+-transient. INa and IK1 densities significantly increase in late-stage cells, contributing to increased upstroke velocity and reduced action potential duration, respectively. Importantly, our in silico model of hiPSC-CM electrophysiological age dependence confirmed IK1 as the key ionic determinant of action potential shortening in older cells. We have made this model available through an open source software interface that easily allows users to simulate hiPSC-CM electrophysiology and Ca2+-handling and select the appropriate age range for their parameter of interest. This tool, together with the insights from our comprehensive experimental characterisation, could be useful in future optimisation of the culture-to-characterisation pipeline in the field of hiPSC-CM research.
Collapse
Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Henry Sutanto
- Department of Cardiology, Cardiovascular Research Institute Maastricht, Faculty of Health, Medicine and Life Sciences, Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands
| | - Rebekka Dülk
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Julius Ryan D Pronto
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Robin Springer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | | | - Aiste Liutkute
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Melanie Ritter
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Philipp Jung
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Lea Stelzer
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Luisa M Hüsgen
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Marie Klopp
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Tony Rubio
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Fleur E Mason
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
| | - Nico Hartmann
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
| | - Steffen Pabel
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Katrin Streckfuss-Bömeke
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- Institute of Pharmacology and Toxicology, University of Würzburg, Würzburg, Germany
| | - Lukas Cyganek
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
| | - Samuel Sossalla
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany
- Clinic for Cardiology and Pneumology, University Medical Center Göttingen, Georg-August University Göttingen, Göttingen, Germany
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Jordi Heijman
- Department of Cardiology, Cardiovascular Research Institute Maastricht, Faculty of Health, Medicine and Life Sciences, Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands.
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University Göttingen, Universitätsmedizin Göttingen, Robert-Koch-Straße 40, 37075, Göttingen, Germany.
- DZHK (German Center for Cardiovascular Research), Partner Site Göttingen, Göttingen, Germany.
- Cluster of Excellence "Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany.
| |
Collapse
|
8
|
Rapedius M, Obergrussberger A, Humphries ESA, Scholz S, Rinke-Weiss I, Goetze TA, Brinkwirth N, Rotordam MG, Strassmaier T, Randolph A, Friis S, Liutkute A, Seibertz F, Voigt N, Fertig N. There is no F in APC: Using physiological fluoride-free solutions for high throughput automated patch clamp experiments. Front Mol Neurosci 2022; 15:982316. [PMID: 36072300 PMCID: PMC9443850 DOI: 10.3389/fnmol.2022.982316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 07/26/2022] [Indexed: 11/13/2022] Open
Abstract
Fluoride has been used in the internal recording solution for manual and automated patch clamp experiments for decades because it helps to improve the seal resistance and promotes longer lasting recordings. In manual patch clamp, fluoride has been used to record voltage-gated Na (NaV) channels where seal resistance and access resistance are critical for good voltage control. In automated patch clamp, suction is applied from underneath the patch clamp chip to attract a cell to the hole and obtain a good seal. Since the patch clamp aperture cannot be moved to improve the seal like the patch clamp pipette in manual patch clamp, automated patch clamp manufacturers use internal fluoride to improve the success rate for obtaining GΩ seals. However, internal fluoride can affect voltage-dependence of activation and inactivation, as well as affecting internal second messenger systems and therefore, it is desirable to have the option to perform experiments using physiological, fluoride-free internal solution. We have developed an approach for high throughput fluoride-free recordings on a 384-well based automated patch clamp system with success rates >40% for GΩ seals. We demonstrate this method using hERG expressed in HEK cells, as well as NaV1.5, NaV1.7, and KCa3.1 expressed in CHO cells. We describe the advantages and disadvantages of using fluoride and provide examples of where fluoride can be used, where caution should be exerted and where fluoride-free solutions provide an advantage over fluoride-containing solutions.
Collapse
Affiliation(s)
- Markus Rapedius
- Nanion Technologies GmbH, Munich, Germany
- *Correspondence: Markus Rapedius,
| | | | | | | | | | | | | | | | | | | | | | - Aiste Liutkute
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Göttingen, Germany
- German Center for Cardiovascular Research, Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells”, University of Göttingen, Göttingen, Germany
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Göttingen, Germany
- German Center for Cardiovascular Research, Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells”, University of Göttingen, Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Georg-August University, Göttingen, Germany
- German Center for Cardiovascular Research, Partner Site Göttingen, Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: From Molecular Machines to Networks of Excitable Cells”, University of Göttingen, Göttingen, Germany
| | | |
Collapse
|
9
|
Rosholm KR, Badone B, Karatsiompani S, Nagy D, Seibertz F, Voigt N, Bell DC. Adventures and Advances in Time Travel With Induced Pluripotent Stem Cells and Automated Patch Clamp. Front Mol Neurosci 2022; 15:898717. [PMID: 35813069 PMCID: PMC9258620 DOI: 10.3389/fnmol.2022.898717] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 05/13/2022] [Indexed: 01/21/2023] Open
Abstract
In the Hollywood blockbuster “The Curious Case of Benjamin Button” a fantastical fable unfolds of a man’s life that travels through time reversing the aging process; as the tale progresses, the frail old man becomes a vigorous, vivacious young man, then man becomes boy and boy becomes baby. The reality of cellular time travel, however, is far more wondrous: we now have the ability to both reverse and then forward time on mature cells. Four proteins were found to rewind the molecular clock of adult cells back to their embryonic, “blank canvas” pluripotent stem cell state, allowing these pluripotent stem cells to then be differentiated to fast forward their molecular clocks to the desired adult specialist cell types. These four proteins – the “Yamanaka factors” – form critical elements of this cellular time travel, which deservedly won Shinya Yamanaka the Nobel Prize for his lab’s work discovering them. Human induced pluripotent stem cells (hiPSCs) hold much promise in our understanding of physiology and medicine. They encapsulate the signaling pathways of the desired cell types, such as cardiomyocytes or neurons, and thus act as model cells for defining the critical ion channel activity in healthy and disease states. Since hiPSCs can be derived from any patient, highly specific, personalized (or stratified) physiology, and/or pathophysiology can be defined, leading to exciting developments in personalized medicines and interventions. As such, hiPSC married with high throughput automated patch clamp (APC) ion channel recording platforms provide a foundation for significant physiological, medical and drug discovery advances. This review aims to summarize the current state of affairs of hiPSC and APC: the background and recent advances made; and the pros, cons and challenges of these technologies. Whilst the authors have yet to finalize a fully functional time traveling machine, they will endeavor to provide plausible future projections on where hiPSC and APC are likely to carry us. One future projection the authors are confident in making is the increasing necessity and adoption of these technologies in the discovery of the next blockbuster, this time a life-enhancing ion channel drug, not a fantastical movie.
Collapse
Affiliation(s)
- Kadla R. Rosholm
- Sophion Bioscience A/S, Ballerup, Denmark
- *Correspondence: Kadla R. Rosholm,
| | | | | | - David Nagy
- Sophion Bioscience Inc., Woburn, MA, United States
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Göttingen, Göttingen, Germany
- German Center for Cardiovascular Research (DZHK), Göttingen, Germany
- Cluster of Excellence “Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells” (MBExC), University of Göttingen, Göttingen, Germany
| | | |
Collapse
|
10
|
Jung P, Seibertz F, Fakuade FE, Mason F, Ebert A, Voigt N. PO-705-05 CALCIUM HANDLING ABNORMALITIES CONTRIBUTE TO ARRHYTHMOGENESIS IN DILATED CARDIOMYOPATHY. Heart Rhythm 2022. [DOI: 10.1016/j.hrthm.2022.03.1076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
11
|
Peper J, Kownatzki-Danger D, Weninger G, Seibertz F, Pronto JRD, Sutanto H, Pacheu-Grau D, Hindmarsh R, Brandenburg S, Kohl T, Hasenfuss G, Gotthardt M, Rog-Zielinska EA, Wollnik B, Rehling P, Urlaub H, Wegener J, Heijman J, Voigt N, Cyganek L, Lenz C, Lehnart SE. Caveolin3 Stabilizes McT1-Mediated Lactate/Proton Transport in Cardiomyocytes. Circ Res 2021; 128:e102-e120. [PMID: 33486968 DOI: 10.1161/circresaha.119.316547] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
Collapse
Affiliation(s)
- Jonas Peper
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Daniel Kownatzki-Danger
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Gunnar Weninger
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology (F.S., J.R.D.P., N.V.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Julius Ryan D Pronto
- Institute of Pharmacology and Toxicology (F.S., J.R.D.P., N.V.), University Medical Center Göttingen
| | - Henry Sutanto
- Cardiology, Cardiovascular Research Institute Maastricht, Maastricht University (H.S., J.H.)
| | - David Pacheu-Grau
- Cellular Biochemistry, University Medical Center, Georg-August-University (D.P.G., P.R.)
| | - Robin Hindmarsh
- Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen
| | - Sören Brandenburg
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Tobias Kohl
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Gerd Hasenfuss
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Michael Gotthardt
- Neuromuscular and Cardiovascular Cell Biology, Max Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin (M.G.).,Cardiology, Virchow Klinikum, Charité-University Medicine, Berlin (M.G.).,DZHK (German Center for Cardiovascular Research), partner site Berlin (M.G.)
| | - Eva A Rog-Zielinska
- University Heart Center, Faculty of Medicine, University of Freiburg (E.A.R.-Z.)
| | - Bernd Wollnik
- Institute of Human Genetics (B.W.), University Medical Center Göttingen.,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Peter Rehling
- Cellular Biochemistry, University Medical Center, Georg-August-University (D.P.G., P.R.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Henning Urlaub
- Bioanalytics, Institute of Clinical Chemistry (H.U., C.L.), University Medical Center Göttingen.,Bioanalytical Mass Spectrometry, Max Planck Institute for Biophysical Chemistry, Göttingen (H.U., C.L.)
| | - Jörg Wegener
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Jordi Heijman
- Cardiology, Cardiovascular Research Institute Maastricht, Maastricht University (H.S., J.H.)
| | - Niels Voigt
- Institute of Pharmacology and Toxicology (F.S., J.R.D.P., N.V.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.)
| | - Lukas Cyganek
- DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.)
| | - Christof Lenz
- Bioanalytics, Institute of Clinical Chemistry (H.U., C.L.), University Medical Center Göttingen.,Bioanalytical Mass Spectrometry, Max Planck Institute for Biophysical Chemistry, Göttingen (H.U., C.L.)
| | - Stephan E Lehnart
- Cellular Biophysics and Translational Cardiology Section, Heart Research Center Göttingen (J.P., D.K.-D., G.W., S.B., T.K., G.H., J.W., S.E.L.), University Medical Center Göttingen.,Cardiology & Pneumology (J.P., D.K.-D., G.W., R.H., S.B., T.K., G.H., J.W., L.C., S.E.L.), University Medical Center Göttingen.,DZHK (German Centre for Cardiovascular Research), partner site Göttingen (F.S., S.B., T.K., G.H., J.W., N.V., L.C., S.E.L.).,Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen (G.H., B.W., P.R., N.V., S.E.L.).,BioMET, Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore (S.E.L.)
| |
Collapse
|
12
|
Kleemann K, Haghighi F, Pietras J, Habich L, Dahlmann J, Rubio T, Seibertz F, Skvorc D, Nourmohammadi S, Volleth M, Voigt N, Zenker M, Kutschka I, Kensah G. Noonan Syndrome-Associated Hypertrophic Cardiomyopathy Caused by a Mutation in RIT1 Can Be Partially Rescued by Inhibition of RAS/MAPK Signaling Pathway In Vitro. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
13
|
Pietras J, Skvorc D, Haghighi F, Seibertz F, Waldmann-Beushausen R, Habich L, Nourmohammadi S, Fietz R, Bähr R, Voigt N, Kutschka I, Kensah G. Generation and Maturation of Human IPSC-Derived Myocardium in a Closed and Automated Bioreactor System. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
14
|
Haghighi F, Liutkute A, Kleemann K, Habich L, Pietras J, Skvorc D, Nourmohammadi S, Dahlmann J, Seibertz F, Rubio T, Voigt N, Lebert J, Christoph J, Cyganek L, Kutschka I, Zenker M, Kensah G. Cardiac Electrophysiological Anomalies Associated with A Noonan Syndrome Mutation in RAF1 Can Be Rescued Partially In Vitro by Inhibition of RAS/MAPK Signaling Pathway. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
15
|
Seibertz F, Reynolds M, Voigt N. Single-Cell Optical Action Potential Measurement in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes. J Vis Exp 2020. [PMID: 33427238 DOI: 10.3791/61890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Conventional intracellular microelectrode techniques to quantify cardiomyocyte electrophysiology are extremely complex, labor intensive, and typically carried out in low throughput. Rapid and ongoing expansion of induced pluripotent stem cell (iPSC) technology presents a new standard in cardiovascular research and alternate methods are now necessary to increase throughput of electrophysiological data at a single cell level. VF2.1Cl is a recently derived voltage sensitive dye which provides a rapid single channel, high magnitude response to fluctuations in membrane potential. It possesses kinetics superior to those of other existing voltage indicators and makes available functional data equivalent to that of traditional microelectrode techniques. Here, we demonstrate simplified, non-invasive action potential characterization in externally paced human iPSC derived cardiomyocytes using a modular and highly affordable photometry system.
Collapse
Affiliation(s)
- Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, Goettingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Goettingen, Germany
| | | | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Center Goettingen, Goettingen, Germany; DZHK (German Center for Cardiovascular Research), Partner Site Goettingen, Germany; Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Goettingen, Germany;
| |
Collapse
|
16
|
Fakuade FE, Steckmeister V, Seibertz F, Gronwald J, Kestel S, Menzel J, Pronto JRD, Taha K, Haghighi F, Kensah G, Pearman CM, Wiedmann F, Teske AJ, Schmidt C, Dibb KM, El-Essawi A, Danner BC, Baraki H, Schwappach B, Kutschka I, Mason FE, Voigt N. Altered atrial cytosolic calcium handling contributes to the development of postoperative atrial fibrillation. Cardiovasc Res 2020; 117:1790-1801. [PMID: 32520995 PMCID: PMC8208741 DOI: 10.1093/cvr/cvaa162] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/04/2020] [Accepted: 06/04/2020] [Indexed: 01/14/2023] Open
Abstract
Aims Atrial fibrillation (AF) is a commonly occurring arrhythmia after cardiac surgery (postoperative AF, poAF) and is associated with poorer outcomes. Considering that reduced atrial contractile function is a predictor of poAF and that Ca2+ plays an important role in both excitation–contraction coupling and atrial arrhythmogenesis, this study aims to test whether alterations of intracellular Ca2+ handling contribute to impaired atrial contractility and to the arrhythmogenic substrate predisposing patients to poAF. Methods and results Right atrial appendages were obtained from patients in sinus rhythm undergoing open-heart surgery. Cardiomyocytes were investigated by simultaneous measurement of [Ca2+]i and action potentials (APs, patch-clamp). Patients were followed-up for 6 days to identify those with and without poAF. Speckle-tracking analysis of preoperative echocardiography revealed reduced left atrial contraction strain in poAF patients. At the time of surgery, cellular Ca2+ transients (CaTs) and the sarcoplasmic reticulum (SR) Ca2+ content were smaller in the poAF group. CaT decay was slower in poAF, but the decay of caffeine-induced Ca2+ transients was unaltered, suggesting preserved sodium-calcium exchanger function. In agreement, western blots revealed reduced SERCA2a expression in poAF patients but unaltered phospholamban expression/phosphorylation. Computational modelling indicated that reduced SERCA activity promotes occurrence of CaT and AP alternans. Indeed, alternans of CaT and AP occurred more often and at lower stimulation frequencies in atrial myocytes from poAF patients. Resting membrane potential and AP duration were comparable between both groups at various pacing frequencies (0.25–8 Hz). Conclusions Biochemical, functional, and modelling data implicate reduced SERCA-mediated Ca2+ reuptake into the SR as a major contributor to impaired preoperative atrial contractile function and to the pre-existing arrhythmogenic substrate in patients developing poAF.
Collapse
Affiliation(s)
- Funsho E Fakuade
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Vanessa Steckmeister
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Fitzwilliam Seibertz
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Judith Gronwald
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Stefanie Kestel
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Julia Menzel
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Molecular Biology, University Medical Centre, Humboldtallee 23, 37075 Göttingen, Germany
| | - Julius Ryan D Pronto
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Karim Taha
- Department of Cardiology, University Medical Centre, Heidelberglaan 100, 3508 GA Utrecht, The Netherlands.,Netherlands Heart Institute, Holland Heart House, Moreelsepark 1, 3511 EP Utrecht, The Netherlands
| | - Fereshteh Haghighi
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - George Kensah
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Charles M Pearman
- Unit of Cardiac Physiology, Division of Cardiovascular Sciences, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Felix Wiedmann
- Department of Cardiology, University Medical Center Heidelberg, Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Germany
| | - Arco J Teske
- Department of Cardiology, University Medical Centre, Heidelberglaan 100, 3508 GA Utrecht, The Netherlands
| | - Constanze Schmidt
- Department of Cardiology, University Medical Center Heidelberg, Heidelberg, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Heidelberg/Mannheim, Germany
| | - Katharine M Dibb
- Unit of Cardiac Physiology, Division of Cardiovascular Sciences, Manchester Academic Health Science Centre, University of Manchester, Manchester, UK
| | - Aschraf El-Essawi
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, Klinikum Braunschweig, Braunschweig, Germany
| | - Bernhard C Danner
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Hassina Baraki
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Blanche Schwappach
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Molecular Biology, University Medical Centre, Humboldtallee 23, 37075 Göttingen, Germany
| | - Ingo Kutschka
- DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany.,Department of Thoracic and Cardiovascular Surgery, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany
| | - Fleur E Mason
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| | - Niels Voigt
- Institute of Pharmacology and Toxicology, University Medical Centre Göttingen, Robert-Koch-Straße 40, 37075 Göttingen, Germany.,DZHK (German Centre for Cardiovascular Research), Partner Site Göttingen, Germany
| |
Collapse
|
17
|
Springer R, Seibertz F, Solano RA, Rubio T, Cyganek L, Zimmermann WH, Voigt N. P1235Acetylcholine-activated inward-rectifier potassium currents in atrial cardiomyocytes derived from induced pluripotent stem cells and atrial engineered heart muscle preparations. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Background
Abnormal activity of muscarinic receptor (M-receptor) activated potassium current (IK,ACh) has been suggested as a potential atrial-specific drug target for antiarrhythmic therapy in patients with atrial fibrillation (AF). Recent work suggests that atrial myocytes derived from human induced pluripotent stem cells (iPSC-CM) hold great potential for in vitro disease modeling and patient-specific drug testing. Here we aim to investigate functional expression of IK,ACh channels in these cells.
Methods
Atrial differentiation was initiated by temporal WNT and retinoic acid signaling modulation. Action potentials (APs) were recorded using sharp electrode technique in engineered heart muscle preparations (EHM). Currents were measured with voltage-clamp technique in atrial and ventricular iPSC-CM. IK,ACh was activated with a saturating concentration of the non-selective M-receptor agonist carbachol (CCh, 2 μM).
Results
APs measured in atrial EHMs were shorter compared to their ventricular counterparts (AP duration at 90% repolarization [APD90]: 163.2±3.7 ms, n=6 [EHMs] vs. 210.2±3.1 ms, n=3, p<0.001). In addition, application of CCh resulted in APD90 reduction by ∼18% and hyperpolarisation of the resting membrane potential in atrial but not in ventricular EHMs, pointing to functional IK,ACh expression in atrial preparations.
Basal inward-rectifier current, (at −100 mV) in the absence of muscarinic receptor agonists was larger in ventricular iPSC-CM compared to atrial differentiation (−26.1±3.8 pA/pF, n=82/5 [n = cells/line] vs. −15.6±1.6 pA/pF, n=71/5, p<0.02.).
CCh-induced current increase, attributed to IK,ACh, was detectable in all myocytes from atrial preparations (−25.2±3.6 pA/pF, n=71/5). The time course of activation with a slow decrease in current amplitude during the continuous presence of CCh resembled measurements in freshly isolated human atrial myocytes. In ventricular iPSC-CM preparations only 13 out of 73 myocytes showed an increase in inward-rectifier current in response to CCh, suggesting that ventricular preparations may contain a minor fraction of atrial myocytes.
Of note, in the presence of the selective IK,ACh blocker tertiapin (100 nM), CCh had no effect on basal inward-rectifier current, providing further evidence for the molecular identity of the CCh-induced current increase as IK,ACh. Interestingly, TTP reduced basal current amplitude in CM isolated from atrial EHMs by ∼54% suggesting that agonist-independent, constitutively active IK,ACh contributes to the basal inward-rectifier current amplitude in these myocytes.
Conclusion
Our data demonstrate that atrial iPSC-CMs express functional IK,ACh-channels, which can be activated by M-receptor agonists. These findings further outline the potential of atrial iPSC-CMs and EHMs as a promising tool for the investigation of channel-associated pathologies such as AF.
Acknowledgement/Funding
grants from the DFG (VO 1568/3-1, IRTG1816, and SFB1002 project A13), the Else-Kröner-Fresenius Foundation (EKFS 2016_A20) and the DZHK (DZHK GOE MD3)
Collapse
Affiliation(s)
- R Springer
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - F Seibertz
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - R A Solano
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - T Rubio
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - L Cyganek
- University Medical Center Gottingen (UMG), Stem Cell Unit, Clinic for Cardiology and Pneumology, Gottingen, Germany
| | - W.-H Zimmermann
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| | - N Voigt
- University Medical Center Gottingen (UMG), Institute of Pharmacology and Toxicology, Gottingen, Germany
| |
Collapse
|